The author maintains in this article that it is possible an approach between the positivistic legal theory, the one that follows the model of the analytical theory developed by Hart, and those others that apply a socio-legal method. Against what some defenders of both perspectives advocate, who view each others with some disdain, the author asserts the need to integrate legal theory with social sciences in the field of juridical ideas. This supposes opening spaces to develop a socio-legal theory of (...) law that lives equally from categories of conceptual analysis and of sociological research. The author rests specially, in order to defend this position, on authors like Roger Coterrell, Denis Galligan, Nicola Lacey and, above all, Brian Tamanaha and William Twinning, whose arguments are here object of special consideration. (shrink)